Process of producing dyed-acidylized-cellulose compounds.



ERICK FBIEIDEMANN, F LEVER-KUSEN, NEAR COLOGNE, GERMANY, ASSIGNOB T0 7 FARBENFABRIKEN VOBM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A

.GOQEPOTION OF GERMANY.

9&7. Specification of Letters Patent. No Drawing.

Patented June 13, 1911.

Application filed March 10, 1911. Serial Ho. 818,560,

Toallwhmn it may concern:

Be it known that I, Enron Famine-MANN, doctor of philosophy, chemist, citizen of the German Empire, residing at Leverkusen, near Cologne, Germany, have invented new and useful Improvements in Dyed-Acidylized-Cellulose Compounds and Processes of Making-Same, of which the following is a specification.

Cellulose esters, such as for instance acetyl cellulose can only be dyed with difiiculty and the dyeing of these bodies according to the hitherto known methods sufiers from the disadvantage that the strength of the cellulose esters is considerabl reduced. I have now found that dyed acldyl celluloses of a great technical value can be obtained in a very simple manner by producing the acidyl derivatives from dyed cellulose compounds, such as cotton, woodcellulose, oxy-cellulose, hydrocellulose, etc. with acidylizing agents. For the dyeing of the cellulose, coloring matters have to be used which are stable against the acid agents employed in the acidylizing process, 6. g. aligol, indanthrene, or'sulfur colors, etc. A gol 'red, helindon scarlet, rosanthrene, diazo brilliant scarlet can for instance be used for red, algoland indanthrene blue for blue, katigen brilliant green for green, katigen violet or diazo indigo blue for violet,

katigen black or immedial black' for black, etc. It is surprising that the shades are not deteriorated by the subsequent process of acidylation, but are even purer after acidylation than before. The

possibility of using the above mentioned yestuifs is of great importance as the shades roduced with them are very fastto li ht. yed -films and other articles of nasty cellulose possessing an excellent fastness to light can thus be produced. The acidylizing process is cari with 4 per cent. of

ried out according to the usual methods.

In order to illustrate the new process more fully the following examples are given, the parts being by weight 1 Example 1.20O

rosant-hrene A and developed on the fiber with the usual developers, such as beta-naphthol, meta-phenylenediamin, etc., are, acetylized according to the process of the British Letters Patent No. 21628/01 with 800 parts of acetic acid anparts of cotton dyed after evaporation of the solvent, a clear' light red film.

Example 2-200 parts of cotton are dyed with 10 per cent. katigen brilliant green and are acetylized as is described in the above mentioned Example 1. The solution leaves, after evaporation of the solvent, a clear dark green film.

Example 3.200 parts of cotton are d ed with 10 per cent. helindon scarlet S and t on acetylized and worked up as described in Examples 1 and 2. A brilliant Vermilion red product is obtained.

Example 4.-According to the process of the German Letters Patent No. 184.201 (see Example 3), 100 parts of cotton, dyed for 1nstance with 20 per cent. algol red B are acetylized with 400 parts of acetic acid an-. hydrid and 1500 parts of benzene. A red product is obtained which dissolves in chloroform. I

'Exam le 5.,200 arts of cotton, dyed with in anthrene RS are formylized with 100 parts of formic acid and 3 to 10 parts of sulfuric acid of 66 B. according to the German Letters Patent No. 189836. A dark blue solution is thus obtained, from which the dark blue formyl cellulose can be precipitated and washed in the usual manner with water, without detriment to the color. It is solublein the usual solvents and blue films etc. can be produced from the solu'- tions. The process is carried out in an analogous manner by using other cellulose compounds or other suitable dyestuffs.

I claim 1. In the art of producing dyed acidylized cellulose compounds, the process consisting in treatin with an acidylizing agent a d ed cellu ose compound, substantially as escribed.

2. In the art of producing dyed acetylized cellulose compounds, the process consisting in treatin with an .acetylizing agent a dyed cellufime compound, substantially as described.

3. In the art of producing dyed acidy- .l'ized cellulose compounds, the process consisting in treating with an acidylizing In testimony whereof I have hereunto agent dyed cotton, substantially as deset my hand in the presence of two sub- 10 scribeidl. h f .d d ed scribing witnesses.

- t e art 0 1'0 ucln y acety- 5 lized cellulose compdimds, th process eon- ERIGH FRIEDEMANN' sisting in treating with an acetylizing Witnesses: agent dyed cotton, substantially as de- CHAS. J. WRIGHT, scribed. ALFRED HENKEL. 

